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This paper presents a cryogenically cooled, dual polarization, low noise Phased Array Feeds receiver for radio astronomy application, which operated at 4–8 GHz. It is designed to be mounted at the focal plane of a dish antenna by producing 4 dense covered, simultaneously operated beams with benefits of increasing Field of View, survey speed, and improving the aperture efficiency of the dish. Development...
In allusion to the difficulties in the optimal gear capacity design of the superconducting controllable reactor (SCR), a novel design optimization method of SCR is proposed in this paper combining field-circuit coupling finite element method (FEM) and Immune Algorithm (IA). Field-circuit coupling finite element method is realized in ANSYS and immune algorithm is embedded in ANSYS by ANSYS Parameter...
An improved bit-parallel RS encoding algorithm, which combines base conversion, multiplication, and base inverse conversion into a matrix operation, is presented in this paper, and a rapid way to generate this matrix is proposed at the same time. It is demonstrated that there is no need to search for the optimal dual basis. Finally, its feasibility and validity have been verified through FPGA platform.
In this paper, a 3 W high power LED array system with an in-line pin fin heat sink is designed, fabricated, and investigated for thermal transient analysis. Preliminary finite element simulation is conducted by ANSYS, and LED array average junction temperature is about 40.9°C. In the experiment, electrical test method is used to evaluate the heat dissipation effect of the LED array system. Experiment...
Large plastic container may induce large deformation of its body when it fills a great deal of substances. In order to make the deformation reduced, more thick of the plastic container wall may be used, but it will make the container heavier. Another way to make the deformation reduced efficiently is to construct some ribs around the container body surface, but where to put the ribs is hard to design...
A novel micromachined resonant pressure sensor designed with DETFs (double-ended tuning forks) resonant beam and differential structure was put forward in this paper. Three groups of DETFs resonant beams form the differential structure to achieve the better sensitivity and make the sensor free of the environment changes. Four beams with the same size compose the DETFs to improve the Q-factor of the...
A new method - time domain finite element (TDFF) - for the transient simulation of lossy and nonuniform multi-conductor transmission lines (MTL) is presented. The method is based on the integral transformation of the telegrapher's equations, combined with recursive convolution method to get the discrete time and space model for frequency-dependent transmission lines. No special technique is required...
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